Invited Review, to appear in Planetary Nebulae beyond the Milky Way, ESO Astrophysics Symposia, eds. Stanghellini, L., Walsh, J. R., Douglas, N. G.
astro-ph/0502037

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MODELLING KINEMATICS AND DARK MATTER:
THE HALOS OF ELLIPTICAL GALAXIES *

Ortwin Gerhard


Astronomisches Institut, Universität Basel, Venusstrasse 7, CH-4102 Switzerland


Abstract. This review is focussed on the outer halos of elliptical galaxies. Its emphasis is on (i) planetary nebulae as test particles to trace the stellar kinematics at large radii, (ii) the observed angular momentum in elliptical galaxy halos and its theoretical relevance, (iii) dynamical modelling of stellar-kinematic data, and (iv) a discussion of the evidence for dark matter halos in ellipticals from a wide range of measurements.


Table of Contents

INTRODUCTION

PLANETARY NEBULAE AS KINEMATIC TRACERS
Does the PN Number Density Follow Light?
Do the PN Kinematics Follow the Absorption Line Stellar Kinematics?
How Many PNe Velocities Are Needed for Orbital and Potential Analysis?

ANGULAR MOMENTUM IN THE OUTER PARTS OF ELLIPTICALS

DYNAMICAL ANALYSIS OF KINEMATIC DATA

THE DYNAMICS AND DARK MATTER HALOS OF ELLIPTICAL GALAXIES
Results from Dynamical Analysis of Absorption Line Profiles
Results from Analyses Including PN or GC Velocities
Results from Gas Rotation Measurements
Results from Modelling X-ray Data
Conclusion

REFERENCES



* To appear in: Planetary Nebulae beyond the Milky Way, ESO Astrophysics Symposia, eds. Stanghellini, L., Walsh, J. R., Douglas, N. G., Springer, Heidelberg. Back.

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